An accident in the southbound lanes of the Pacific Motorway at Helensvale is causing delays.

According to police a semi-trailer has collided with a number of cars between Smith Street and Helensvale.

Traffic diversions are in place with southbound traffic being diverted to Brisbane Road.

It is unknown at this stage if anyone is injured or how many cars involved.

Traffic delays are expected so motorists are advised to use alternate routes where possible.

Four people have been taken to Gold Coast Hospital after the accident, with one hurt seriously.